US20130075965A1 - External shear-hub isolator - Google Patents
External shear-hub isolator Download PDFInfo
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- US20130075965A1 US20130075965A1 US13/682,799 US201213682799A US2013075965A1 US 20130075965 A1 US20130075965 A1 US 20130075965A1 US 201213682799 A US201213682799 A US 201213682799A US 2013075965 A1 US2013075965 A1 US 2013075965A1
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- Prior art keywords
- structural member
- bore
- exhaust system
- shear
- elastomeric
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
- F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
- F01N13/1811—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
- F16F1/373—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by having a particular shape
- F16F1/3732—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by having a particular shape having an annular or the like shape, e.g. grommet-type resilient mountings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
- F16F1/42—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by the mode of stressing
- F16F1/50—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by the mode of stressing loaded mainly in shear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F3/00—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic
- F16F3/08—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic with springs made of a material having high internal friction, e.g. rubber
- F16F3/087—Units comprising several springs made of plastics or the like material
- F16F3/0873—Units comprising several springs made of plastics or the like material of the same material or the material not being specified
Definitions
- the present disclosure relates to an isolator such as an automotive exhaust system isolator. More particularly, the present disclosure relates to an isolator which is configured to provide a very soft on-center rate, to have the ability to endure spike durability loads and to avoid compression of the shear-hub element during compression.
- automotive vehicles including cars and trucks have an internal combustion engine which is coupled to at least a transmission and a differential for providing power to the drive wheels of the vehicle.
- An engine exhaust system which typically includes an exhaust pipe, a catalytic converter and a muffler is attached to the engine to quiet the combustion process, to clean the exhaust gases and to route the products of combustion away from the engine to a desired position typically at the rear of the vehicle.
- the exhaust system is supported by exhaust mounts which are positioned between the exhaust system and the frame or some other supporting structure of the vehicle body.
- the exhaust mounts incorporate flexible members or elastic suspension members to isolate the vehicle's exhaust system from the vehicle's body.
- the isolator include a soft on-center rate of deflection.
- the prior art exhaust mounts or isolators have included rubber isolators which are a solid rubber component or a puck that is at least three-quarters of an inch thick and which is provided with at least one pair of apertures extending therethrough.
- the apertures each receive an elongated metal stud.
- the metal stud is provided with an enlarged tapered head that can be forced through the aperture in the isolator, but it cannot be readily removed from the isolator.
- the opposite end of the stud is welded to or otherwise secured to either a support point in the vehicle or to one of the components of the exhaust system.
- isolators include elastomeric moldings of a spoke design where spokes are loaded in tension and compression and a shear leg design that include a leg that is subjected to shearing in the primary loading direction.
- spokes are loaded in tension and compression
- shear leg design that include a leg that is subjected to shearing in the primary loading direction.
- Most elastomers which are utilized for exhaust isolators exhibit poor tensile fatigue properties stemming from low tear strength properties.
- the preferred method to load the elastomeric material is in compression or shear.
- the prior art spoke design isolators load the elastomeric material in compression and tension.
- the tensile loading makes the design vulnerable to fractures in overloaded conditions.
- the stress magnitude is directly proportional to the load divided by the minimum spoke cross-sectional area.
- An additional requirement of the spoke design is that the mating component or hanger pin be centered within the deflection zone while statically preloaded by the weight of the exhaust. If it is not, the voids designed into the isolator will be bottomed out or positioned in a groundout condition. This results in the soft on-center rate not being employed, thus defeating the purpose of the isolator.
- elastomeric mounts which include a soft on-center rate while avoiding the undesirable tension loading of the elastomeric bushing and which avoid compression of the shear-hub during high ground-out loads.
- the present disclosure provides the art with an elastomeric bushing which uses radial loading to avoid the tension stress loading of the bushing.
- the radial loading causes shear stresses of the elastomeric bushing regardless of the direction of the loading. Tuning for rate and deflection in specific directions can be independent from other directions by altering voids in the elastomeric bushings.
- the elastomeric bushing includes a shear-hub which does not compress during high ground-out loads experienced by the isolator. This design also allows the elastomeric bushing to be more compact for reduced package design.
- FIG. 1 is a perspective view of an elastomeric isolator assembled to a bracket in accordance with the present disclosure
- FIG. 2 is a cross-sectional view of the elastomeric isolator illustrated in FIG. 1 ;
- FIG. 4 is a perspective view partially in cross-section of an elastomeric isolator in accordance with another embodiment of the present disclosure
- FIG. 5 is a perspective view of an exhaust system which incorporates the unique exhaust isolators in accordance with the present disclosure.
- FIG. 6 is a perspective view of an elastomeric isolator and bracket in accordance with another embodiment of the present disclosure.
- FIG. 7 is a cross-sectional view of the elastomeric isolator illustrated in FIG. 6 .
- FIG. 8 is a perspective view of an elastomeric isolator in accordance with another embodiment of the present disclosure.
- FIG. 9 is a cross-sectional view of the elastomeric member illustrated in FIG. 8 .
- FIG. 11 is a perspective view of an elastomeric isolator in accordance with another embodiment of the present disclosure.
- FIG. 14 is a perspective view of an elastomeric isolator in accordance with another embodiment of the present disclosure.
- FIG. 15 is a cross-sectional view of the elastomeric member illustrated in FIG. 14 .
- Exhaust system isolator 34 comprises an inner structural member 50 , an outer structural member 52 and an elastomeric body 54 disposed between structural members 50 and 52 .
- void 66 specifically its radial thickness, will determine the amount of travel of mounting bore 58 with respect to outer structural member 52 and bracket 32 until the load to radially deflect exhaust system isolator assembly 30 spikes up due to the closing of void 66 .
- the radial movements of mounting bore 58 cause pure shear in elastomeric body 54 regardless of the loading direction. This shear loading occurs in the portion of elastomeric body 54 disposed between outer structural member 52 and inner structural member 50 as discussed below.
- An annular elastomeric heat shield 272 forms the outer portion of outer circumferential void 264 .
- Elastomeric heat shield 272 is integral with elastomeric body 254 .
- Elastomeric heat shield 272 provides protection against external sources of heat for shear hub 270 .
- the portion of elastomeric body 338 which encases first inner structural member 332 is attached to the portion of elastomeric body 338 that covers outer structural member 336 by annular shear hub 352 .
- the portion of elastomeric body 338 which encases second inner structural member 334 is attached to the portion of elastomeric body 338 that covers outer structural member 336 by annular shear hub 354 .
- annular shear hubs 352 and 354 are loaded in shear.
- first circumferential void 346 and/or second circumferential void 348 will close.
- Annular shear hubs 352 and 354 surround first and second bores 340 and 342 , respectively, such that any radial loading from the application causes shear stress in annular shear hubs 352 and 354 .
- annular shear hubs 352 and 354 are not disposed between portions of inner structural members 332 and 334 and outer structural member 336 which will contact each other during peak loading. Thus, during peak loadings, annular shear hubs 352 and 354 are not compressed between inner structural members 332 and 334 and outer structural member 336 .
- Elastomeric body 338 defines a first chamfer 394 located at one of second bore 342 and a second chamfer 396 at the opposite end of second bore 342 .
- First chamfer 394 interfaces with an enlarged head on hanger pin 60 .
- Second chamfer 396 is larger than first chamfer 394 and it allows for conical rotation or deflection of second inner structural member 334 with respect to hanger pin 60 and outer structural member 336 .
- the large diameter of second chamfer 396 is approximately one and one-half times the diameter of second bore 342 and second chamfer 396 has an overall length in the axial direction of second bore 342 of approximately twenty millimeters.
- Exhaust system isolator 430 can be a replacement for exhaust system isolator assembly 30 .
- Exhaust system isolator 430 comprises a first inner structural member 432 , a second inner structural member 434 , an outer structural member 436 and an elastomeric body 438 .
- Elastomeric body 438 defines a first bore 440 and a second bore 442 , each of which is designed as a structural member to accept an inner tube, a bolt or hanger pin 60 .
- One hanger pin 60 is attached to a structural component of the vehicle and one hanger pin 60 is attached to a component of exhaust system 10 .
- Elastomeric body 438 defines a first circumferential void 446 which is disposed around first bore 440 and a second circumferential void 448 which is disposed around second bore 442 .
- the design for circumferential void 446 will determine the amount of travel of first bore 440 with respect to outer structural member 436 .
- the design for circumferential void 448 will determine the amount of travel of second bore 442 with respect to outer structural member 436 .
- the design of circumferential voids 446 and 448 will determine the amount of travel of first bore 440 with respect to second bore 442 until the load to radically defect exhaust system isolator 430 spikes up due to the closing of circumferential voids 446 and 448 .
- first annular or frustoconical shear hub 452 and a second annular or frustoconical shear hub 454 defined by elastomeric body 438 .
- First annual shear hub 452 is disposed between first inner structural member 432 and outer structural member 436 .
- Second annular shear hub 454 is disposed between second inner structural member 434 and outer structural member 436 .
- Tuning for rate and deflection in selected directions can be accomplished independently from other directions by altering the design of elastomeric body 438 using different shaped voids, different wall thickness, different shapes for elastomeric body 438 and by other means known in the art.
- exhaust system isolator 430 spikes up because the load is now being resisted by outer structural member 436 and one or both of inner structural members 432 and 434 rather than annular shear hub 452 and/or annular shear hub 454 .
- One of the advantages for exhaust system isolator 430 is that when circumferential voids 446 and/or 448 close, there is no direct tension or compression of annular shear hubs 452 and/or 454 .
- First inner structural member 432 is a metal or plastic component which comprises a generally cylindrical center portion 462 and an annular flange portion 464 attached to one end of generally cylindrical center portion 462 .
- Generally cylindrical center portion 462 extends over first bore 440 and flange portion 464 extends radially outward from the one end of generally cylindrical center portion 462 .
- Flange portion 464 provides a base for one end of annular shear hub 452 .
- Elastomeric body 438 fully encapsulates first inner structural member 432 and is bonded to inner structural member 432 including annular shear hub 452 to annular flange portion 464 .
- Second inner structural member 434 is a metal or plastic component which comprises a generally cylindrical center portion 472 and an annular flange portion 474 attached to one end of generally cylindrical center portion 472 .
- Generally cylindrical center portion 472 extends over second bore 442 and flange portion 474 extends radially outward from the one end of generally cylindrical center portion 472 .
- Flange portion 474 provides a base for one end of annular shear hub 454 .
- Elastomeric body 438 fully encapsulates second inner structural member 434 and is bonded to inner structural member 434 including annual shear hub 454 to annular flange portion 474 .
- flange portions 464 and 474 are located on opposite sides of exhaust system isolator 430 .
- Outer structural member 436 is a metal or plastic component which comprises a central portion 480 , a first axially extending cylindrical portion 482 and a second axial extending cylindrical portion 484 .
- Central portion 480 is a generally planar component having a generally L-shaped flange on its outer periphery. Central portion 480 defines a first bore 486 and a second bore 488 .
- First inner structural member 432 extends through first bore 486 and is surrounded by first axially extending cylindrical portion 482 .
- Second inner structural member 434 extends through second bore 488 and is surrounded by second axially extending cylindrical portion 484 .
- Central portion 480 and first axially extending cylindrical portion 482 provide a base for annular shear hub 452 .
- Central portion 480 and second axially extending cylindrical portion 484 provide a base for annular shear hub 454 .
- Elastomeric body 438 fully encapsulates outer structural member 436 and is bonded to outer structural member 436 including annular shear hubs 452 and 454 being bonded to outer structural member 436 .
- Annular shear hubs 452 and 454 surround first and second bores 440 and 442 , respectively, such that any radial loading from the application causes shear stress in annular shear hubs 452 and 454 .
- annular shear hubs 452 and 454 are not disposed between portions of inner structural members 432 and 434 and outer structural member 436 which will contact each other during peak loadings. Thus, during peak loadings, annular shear hubs 452 and 454 are not compressed between inner structure members 432 and 434 and outer structural member 436 .
- Elastomeric body 438 defines a first chamfer 490 located at one end of first bore 440 , and a second chamfer 492 at the opposite end of first bore 440 .
- First chamfer 490 interfaces with an enlarged head on hanger pin 60 .
- Second chamfer 492 is larger than first chamfer 490 and it allows for conical rotation or deflection for first inner structural member 432 with respect to hanger pin 60 and outer structural member 436 .
- the large diameter of second chamfer 492 is approximately one and one-half times the diameter of first bore 440 and second chamfer 492 has an overall length in the axial direction of first bore 440 of approximately twenty millimeters.
- Elastomeric body 438 defines a first chamfer 494 located at one of second bore 442 and a second chamfer 496 at the opposite end of second bore 442 .
- First chamfer 494 interfaces with an enlarged head on hanger pin 60 .
- Second chamfer 496 is larger than first chamfer 494 and it allows for conical rotation or deflection of second inner structural member 434 with respect to hanger pin 60 and outer structural member 436 .
- the large diameter of second chamfer 496 is approximately one and one-half times the diameter of second bore 442 and second chamfer 496 has an overall length in the axial direction of second bore 442 of approximately twenty millimeters.
- Exhaust system isolator 530 can be a replacement for exhaust system isolator assembly 30 .
- Exhaust system isolator 530 comprises a first inner structural member 532 , a second inner structural member 534 , an outer structural member 536 and an elastomeric body 538 .
- Elastomeric body 538 defines a first bore 540 and a second bore 542 each of which is designed as a structural member to accept an inner tube, a bolt or hanger pin 60 .
- One hanger pin 60 is attached to a structural component of this vehicle and one hanger pin 60 is attached to a component of exhaust system 10 .
- annular shear hub 552 and annular shear hub 554 combine to form a single common or integral shear hub.
- Tuning for rate and deflection in selected directions can be accomplished independently from other directions by altering the design of elastomeric body 538 using different shaped voids, different wall thicknesses, different shapes for elastomeric body 538 and by other means known in this art.
- First inner structural member 532 is a metal or plastic component which comprises a generally cylindrical center portion 562 and an annular flange portion 564 attached to one end of generally cylindrical center portion 562 .
- Generally cylindrical center portion 562 extends over first bore 540 and flange portion 564 extends radially outward from the one end of generally cylindrical center portion 562 .
- Flange portion 564 provides a base for one end of annular shear hub 552 .
- Elastomeric body 538 fully encapsulates first inner structural member 532 and is bonded to first inner structural member 532 including annular shear hub 552 to flange portion 564 .
- Second inner structural member 534 is a metal or plastic component which comprises a generally cylindrical center portion 572 and an annular flange portion 574 attached to one end of generally cylindrical center portion 572 .
- Generally cylindrical center portion 572 extends over second bore 542 and flange portion 574 extends radially outward from the one end of generally cylindrical center portion 572 .
- Flange portion 574 provides a base for one end of annular shear hub 554 .
- Elastomeric body 538 fully encapsulates second inner structural member 534 and is bonded to second inner structural member 534 including annular shear hub 554 to flange portion 574 .
- flange portions 564 and 574 are located on opposite sides of exhaust system isolator 530 .
- Outer structural member 536 is a metal or plastic component which comprises a central portion 580 , a first axially extending portion 582 and a second axially extending portion 584 .
- Central portion 580 is a generally oval shaped component having a generally L-shaped flange on its outer periphery.
- Central portion 580 defines a central bore 586 .
- First inner structural member 532 extends through central bore 586 and is partially surrounded by first axially extending portion 582 .
- Second inner structural member 534 also extends through central bore 586 and is partially surrounded by second axially extending portion 584 .
- Central portion 580 and first axial extending portion 582 provide a base for annular shear hub 552 .
- Annular shear hubs 552 and 554 surround first and second bores 540 and 542 , respectively, such that any radial loading from the application causes shear stress in annular shear hubs 552 and 554 .
- annular shear hubs 552 and 554 are not disposed between portions of inner structural members 532 and 534 and outer structural member 336 which will contact each other during peak loading.
- the portion of annular shear hubs 552 and 554 located between first bore 540 and second bore 542 which form the single, common or integral shear hub, could undergo compression if the loading caused first bore 540 to move directly towards second bore 542 but this is a limited movement of exhaust system isolator 530 .
- Elastomeric body 538 defines a first chamfer 590 located at one end of first bore 540 and a second chamfer 592 at the opposite end of first bore 540 .
- First chamfer 590 interfaces with an enlarged head on hanger pin 60 .
- Second chamfer 592 is larger than first chamfer 590 and it allows for conical rotation or deflection of first inner structural member 532 with respect to hanger pin 60 and outer structural member 536 .
- the large diameter of second chamfer 592 is approximately one and one-half times the diameter of first bore 540 and second chamfer 592 has an overall length in the axial direction of first bore 540 of approximately twenty millimeters.
- Exhaust system isolator 630 in accordance with another embodiment of the present disclosure is illustrated.
- Exhaust system isolator 630 comprises an inner structural member 632 , an outer structural member 634 and an elastomeric body 636 .
- Elastomeric body 636 defines a circumferential void 646 which is located below first mounting bore 640 .
- the portion of elastomeric body 636 that forms second mounting bore 642 defines circumferential void 646 .
- the design of circumferential void 646 and the design of the portion of elastomeric body 636 that forms second mounting bore 642 will determine the amount of travel of second mounting bore 642 with respect to first mounting bore 640 until the load to radially deflect exhaust system isolator 630 spikes up due to the closing of circumferential void 646 or the gap between the portion of elastomeric body 636 that defines second mounting bore 642 and the portion of elastomeric body 636 that encases outer structural member 634 .
- Annular shear hub 650 is arranged in an axial direction of exhaust system isolator 630 such that any radial loading from the application causes shear stress in annular shear hub 650 .
- annular shear hub 650 is not disposed between portions of inner structural member 632 and outer structural member 634 which will contact each other during peak loading. Thus, during peak loadings, annular shear hub 650 is not compressed between inner structural member 632 and outer structural member 634 .
- Elastomeric body 636 defines a first chamfer 690 located at one end of second mounting bore 642 and a second chamfer 692 located at the opposite end of second mounting bore 642 .
- First chamfer 690 interfaces with an enlarged head on hanger pin 60 .
- Second chamfer 692 is larger than first chamfer 690 and it allows for the conical rotation or deflection of inner structural member 632 with respect to hanger pin 60 and outer structural member 634 .
- the larger diameter of second chamfer 692 is approximately one and one-half times the diameter of second mounting bore 642 and second chamfer 692 has an overall length of approximately twenty millimeters.
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Abstract
Description
- The present application is a continuation of U.S. Ser. No. 12/369,024 filed Feb. 11, 2009 which is a continuation-in-part of U.S. Ser. No. 12/045,139 filed Mar. 10, 2008 and a continuation-in-part of U.S. Ser. No. 12/043,498 filed Mar. 6, 2008. The disclosures of which are hereby incorporated herein by reference.
- The present disclosure relates to an isolator such as an automotive exhaust system isolator. More particularly, the present disclosure relates to an isolator which is configured to provide a very soft on-center rate, to have the ability to endure spike durability loads and to avoid compression of the shear-hub element during compression.
- The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
- Typically, automotive vehicles including cars and trucks have an internal combustion engine which is coupled to at least a transmission and a differential for providing power to the drive wheels of the vehicle. An engine exhaust system which typically includes an exhaust pipe, a catalytic converter and a muffler is attached to the engine to quiet the combustion process, to clean the exhaust gases and to route the products of combustion away from the engine to a desired position typically at the rear of the vehicle. The exhaust system is supported by exhaust mounts which are positioned between the exhaust system and the frame or some other supporting structure of the vehicle body. In order to prevent engine vibrations from being transmitted to the car body, the exhaust mounts incorporate flexible members or elastic suspension members to isolate the vehicle's exhaust system from the vehicle's body. In order to effectively isolate the vehicle's exhaust system from the vehicle's body, it is preferred that the isolator include a soft on-center rate of deflection.
- The prior art exhaust mounts or isolators have included rubber isolators which are a solid rubber component or a puck that is at least three-quarters of an inch thick and which is provided with at least one pair of apertures extending therethrough. The apertures each receive an elongated metal stud. The metal stud is provided with an enlarged tapered head that can be forced through the aperture in the isolator, but it cannot be readily removed from the isolator. The opposite end of the stud is welded to or otherwise secured to either a support point in the vehicle or to one of the components of the exhaust system.
- Other designs for isolators include elastomeric moldings of a spoke design where spokes are loaded in tension and compression and a shear leg design that include a leg that is subjected to shearing in the primary loading direction. Most elastomers which are utilized for exhaust isolators exhibit poor tensile fatigue properties stemming from low tear strength properties. The preferred method to load the elastomeric material is in compression or shear.
- The prior art puck design is the simplest design, and as discussed above, two pins are inserted at opposite ends of the elastomer and the loads inflict pure tension on the elastomer cords connecting both ends. While this is typically the lowest cost design, it is also the most abusive to the material. In order to offset the failure risk, flexible and/or rigid bands are typically designed inside or around the outside of the elastomeric puck. The advantage of this design is its ability to swivel about one hanger hole to accommodate large positional tolerances for the hanger.
- The prior art spoke design isolators load the elastomeric material in compression and tension. The tensile loading makes the design vulnerable to fractures in overloaded conditions. The stress magnitude is directly proportional to the load divided by the minimum spoke cross-sectional area. An additional requirement of the spoke design is that the mating component or hanger pin be centered within the deflection zone while statically preloaded by the weight of the exhaust. If it is not, the voids designed into the isolator will be bottomed out or positioned in a groundout condition. This results in the soft on-center rate not being employed, thus defeating the purpose of the isolator.
- The prior art shear leg design has a primary loading direction which is typically vertical and a secondary loading direction which is typically lateral. When the shear leg design is loaded in its primary loading direction, the loading method is the preferred shear style loading. In addition, this shear style loading is able to be designed desirably soft. However, the secondary loading direction inflicts tensile compressive stresses which are unfavorable for durability. In addition, the secondary loading direction has a rate that is two to three times stiffer than the primary rate which is also an unfavorable condition.
- The continued development of elastomeric mounts has been directed to elastomeric mounts which include a soft on-center rate while avoiding the undesirable tension loading of the elastomeric bushing and which avoid compression of the shear-hub during high ground-out loads.
- The present disclosure provides the art with an elastomeric bushing which uses radial loading to avoid the tension stress loading of the bushing. The radial loading causes shear stresses of the elastomeric bushing regardless of the direction of the loading. Tuning for rate and deflection in specific directions can be independent from other directions by altering voids in the elastomeric bushings. The elastomeric bushing includes a shear-hub which does not compress during high ground-out loads experienced by the isolator. This design also allows the elastomeric bushing to be more compact for reduced package design.
- Further areas of applicability of the present disclosure will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the disclosure, are intended for purposes of illustration only and are not intended to limit the scope of the disclosure.
- The present disclosure will become more fully understood from the detailed description and the accompanying drawings, wherein:
-
FIG. 1 is a perspective view of an elastomeric isolator assembled to a bracket in accordance with the present disclosure; -
FIG. 2 is a cross-sectional view of the elastomeric isolator illustrated inFIG. 1 ; -
FIG. 3 is a perspective view partially in cross-section illustrating the metal or plastic inserts of the elastomeric isolator illustrated inFIG. 1 ; -
FIG. 4 is a perspective view partially in cross-section of an elastomeric isolator in accordance with another embodiment of the present disclosure; -
FIG. 5 is a perspective view of an exhaust system which incorporates the unique exhaust isolators in accordance with the present disclosure. -
FIG. 6 is a perspective view of an elastomeric isolator and bracket in accordance with another embodiment of the present disclosure. -
FIG. 7 is a cross-sectional view of the elastomeric isolator illustrated inFIG. 6 . -
FIG. 8 is a perspective view of an elastomeric isolator in accordance with another embodiment of the present disclosure; -
FIG. 9 is a cross-sectional view of the elastomeric member illustrated inFIG. 8 . -
FIG. 10 is a perspective view partially in cross section illustrating the metal or plastic inserts of the elastomeric isolator illustrated inFIG. 8 . -
FIG. 11 is a perspective view of an elastomeric isolator in accordance with another embodiment of the present disclosure. -
FIG. 12 is a cross-sectional view of the elastomeric member illustrated inFIG. 11 . -
FIG. 13 is a perspective view partially in cross section illustrating the metal or plastic inserts of the elastomeric isolator illustrated inFIG. 11 . -
FIG. 14 is a perspective view of an elastomeric isolator in accordance with another embodiment of the present disclosure. -
FIG. 15 is a cross-sectional view of the elastomeric member illustrated inFIG. 14 . -
FIG. 16 is a perspective view partially in cross section illustrating the metal or plastic inserts of the elastomeric isolator illustrated inFIG. 14 . -
FIG. 17 is a perspective view of an exhaust system isolator in accordance with another embodiment of the present disclosure. -
FIG. 18 is a cross-sectional view of the exhaust system isolator illustrated inFIG. 17 . -
FIG. 19 is a perspective view partially in cross-section of the exhaust system isolator illustrated inFIGS. 17 and 18 . - The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the disclosure, its application, or uses.
- Referring now to the drawings, there is shown in
FIG. 5 an exhaust system which includes the exhaust system isolators in accordance with the present disclosure and which is designated generally by the reference numeral 10. A typical vehicle comprises an internal combustion engine (not shown), a body (not shown), a suspension system (not shown) and exhaust system 10 which is attached to the internal combustion engine and which is supported typically beneath the vehicle. The internal combustion engine is designed to power one or more drive wheels of the vehicle and the exhaust system routes the products of combustion to a desired exhaust location around the outside of the vehicle. - Exhaust system 10 comprises an
intermediate pipe 12, amuffler 14, atailpipe 16 and a plurality of isolator assemblies of various designs.Intermediate pipe 12 is typically connected to the engine or to a catalytic converter (not shown) which is then attached to an exhaust pipe which extends between the engine and the catalytic converter. The catalytic converter may be attached to a single exhaust pipe which leads to a single exhaust manifold or the catalytic converter can be attached to a branched exhaust pipe which leads to a plurality of exhaust pipes which lead to a plurality of exhaust manifolds. Also,intermediate pipe 12 can be attached to a plurality of catalytic converters which connect together prior to reachingmuffler 14 usingintermediate pipe 12 or the vehicle can have a plurality of exhaust pipes, a plurality of catalytic converters, a plurality ofintermediate pipes 12 and a plurality ofmufflers 14 which connect together using a single ormultiple tailpipes 16. In addition, the exhaust system isolator of the present disclosure is applicable to any type of exhaust system including but not limited to dual exhaust systems which have two separate parallel exhaust systems extending from the internal combustion system. - Exhaust system 10 is utilized to route the exhaust gases from the engine to a desired location around the outside of the vehicle. While traveling through the exhaust system, the catalytic converter cleans the exhaust gases and
muffler 14 quiets the noise created during the combustion process in the engine. The present disclosure is directed toward the exhaust system isolators which mount exhaust system 10 to the vehicle while at the same time, isolate the movement of exhaust system 10 with respect to the vehicle. - Referring now to
FIGS. 1-3 , an exhaustsystem isolator assembly 30 comprises abracket 32 and anexhaust system isolator 34.Bracket 32 is a metal or plastic component which defines a pair of mountingflanges 36 and anisolator interface 38. Each of the pair of mountingflanges 36 defines a mountingbore 40 which accepts a fastener for securing exhaustsystem isolator assembly 30 to a vehicle frame or another structural component of the vehicle. WhileFIG. 1 illustrates mountingflanges 36 being generally perpendicular to each other, it is within the scope of the present disclosure to arrange mountingflanges 36 in any orientation which is required to havebracket 32 properly interface with the mounting structure of the vehicle. - Exhaust system isolator 34 comprises an inner
structural member 50, an outerstructural member 52 and anelastomeric body 54 disposed betweenstructural members -
Elastomeric body 54 defines a mounting bore 58 which is designed to accept an inner tube, a bolt, or ahanger pin 60.Hanger pin 60 is attached to a component of exhaust system 10. Whilebracket 32 is disclosed as being attached to a structural component of the vehicle andexhaust system isolator 34 is disclosed as being attached to a component of exhaust system 10, usinghanger pin 60, it is within the scope of the present disclosure to havebracket 32 attached to exhaust system 10 and exhaust system isolator 34 attached to a structural component of the vehicle usinghanger pin 60. Thus, exhaust system 10 is secured to the vehicle through one or more exhaustsystem isolator assemblies 30. -
Elastomeric body 54 defines one or more press-fittingapertures 62 that extend throughelastomeric body 54 and through innerstructural member 50. Press-fittingapertures 62 allow for the press-fitting of outerstructural member 52 ontobracket 32. Another option would be to integrate outerstructural member 52 andbracket 32 such that outerstructural member 52 is attached to exhaust system 10 or the structural component of the vehicle. After press-fit, typically a crimping ofbracket 32 over outerstructural member 52 further secures the attachment. If tuning of exhaust system isolator 34 in different directions is needed, press-fit apertures 62 can be used to provide a non-continuous annular wall forelastomeric body 54.Elastomeric body 54 defines an outercircumferential void 64 and an innercircumferential void 66. Whilevoid 66 is illustrated as being asymmetrical with respect to mounting bore 58, it is within the scope of the present disclosure to have void 66 symmetrical with mounting bore 58. The asymmetrical design forvoid 66 permits mounting bore 58 to become disposed at or near the centerline of outerstructural member 52 during the assembled or statically loaded condition of exhaustsystem isolator assembly 30. - The design of
void 66, specifically its radial thickness, will determine the amount of travel of mounting bore 58 with respect to outerstructural member 52 andbracket 32 until the load to radially deflect exhaustsystem isolator assembly 30 spikes up due to the closing ofvoid 66. Until the closing ofvoid 66, the radial movements of mounting bore 58 cause pure shear inelastomeric body 54 regardless of the loading direction. This shear loading occurs in the portion ofelastomeric body 54 disposed between outerstructural member 52 and innerstructural member 50 as discussed below. - As can be seen in the figures, void 64 overlaps inner
circumferential void 66 in the axial direction to define ashear hub 70 which undergoes the shear loading due to the deflection ofelastomeric body 54. During larger loading of exhaustsystem isolator assembly 30, void 66 will close until innerstructural member 50 makes contact withbracket 32 ifbracket 32 is provided separate from outerstructural member 52 or with outerstructural member 52 ifbracket 32 is integrated into outerstructural member 52. This contact between innerstructural member 50 andbracket 32 or outerstructural member 52 eliminates the compression and thus the compression stresses onshear hub 70 when exhaustsystem isolator assembly 30 experiences high ground-out loads. This improves both the performance and the reliability of exhaustsystem isolator assembly 30. - An optional annular
elastomeric heat shield 72 forms the outer portion of outercircumferential void 64.Elastomeric heat shield 72 is integral withelastomeric body 54.Elastomeric heat shield 72 provides protection against external sources of heat forshear hub 70. - Inner
structural member 50 is a flanged cylindrical metal or plastic component which includes anaxial cylinder 76 and aradial flange 78.Axial cylinder 76 extends over mounting bore 58 andradial flange 78 extends radially outward fromaxial cylinder 76 to provide a base forshear hub 70.Elastomeric body 54 is bonded to innerstructural member 50 includingshear hub 70 being bonded toradial flange 78. - Outer
structural member 52 is a flanged cylindrical metal or plastic component which includes anaxial cylinder 82 and aradial flange 84.Axial cylinder 82 extends along the outer circumferential surface of innercircumferential void 66 and is designed to be press-fit or otherwise acceptbracket 32. While exhaustsystem isolator assembly 30 is illustrated using aseparate bracket 32, it is within the scope of the present disclosure to integrate outerstructural member 52 andbracket 32 andbond shear hub 70 directly tobracket 32.Radial flange 84 extends radially outwardly fromaxial cylinder 76 to provide a base forshear hub 70 at the opposite end ofshear hub 70.Elastomeric body 54 is bonded to outerstructural member 52 includingshear hub 70 being bonded toradial flange 84. -
Bracket 32 is a metal or plastic bracket having an innercylindrical wall 86, anouter wall 88 and aradial wall 90 extending between innercylindrical wall 86 andouter wall 88. Innercylindrical wall 86 is designed to be press-fit within an aperture defined byaxial cylinder 82 of outerstructural member 52 as illustrated inFIG. 2 . - Referring now to
FIG. 2 , it can be seen thataxial cylinder 76 of innerstructural member 50 extends through the aperture defined byaxial cylinder 82 of outerstructural member 52 and through innercylindrical wall 86 ofbracket 32. This provides a travel stop for the radial movement of innerstructural member 50 in relation to outerstructural member 52 which eliminates compression and thus compression stresses onshear hub 70. Innerstructural member 50 will move radially with respect to outerstructural member 52 to close innercircumferential void 66 until innerstructural member 50contacts bracket 32. An annular portion ofelastomeric body 54 located on the outside of innerstructural member 50 provides a cushioning affect and avoids direct contact between innerstructural member 50 andbracket 32. Ifbracket 32 is integrated with outerstructural member 52 to attach exhaustsystem isolator assembly 30 to the structural component of the vehicle, eitheraxial cylinder 82 of outerstructural member 52, the structural component of the vehicle or a separate bracket can be used for the stop. - Exhaust system isolator 34 avoids tension stress loading in
elastomeric body 54 during radial loading. The shear style loading in all directions enables exhaust system isolator 34 to achieve a lower and more stable rate of deflection. This is because the shear modulus (shear loading) is lower than the elasticity modulus (tensile loading). Also, the spring rate of elastomeric materials in shear is more consistent than in tensile. The rates and deflections are capable of being symmetrical about the center axis or they can be tuned using press-fit apertures 62 or by otherwise altering the size or shape ofelastomeric body 54 or the rigid structures. An additional advantage is that the rate of deflection forshear hub 70 is linear throughout the deflection (untilvoid 66 closes) which adds robustness to the design in regards to the position. This means that any pre-load from positional tolerances will not spike the rates of deflection and make the Noise, Vibration and Harshness (NVH) of the vehicle change with the exhaust geometry tolerances. - Referring now to
FIG. 4 , an exhaustsystem isolator assembly 130 in accordance with another embodiment of the present disclosure is disclosed. Exhaustsystem isolator assembly 130 comprises abracket 132 and a pair of exhaust system isolators 34. The use ofbracket 132 instead ofbracket 32 permits exhaustsystem isolator assembly 130 to be attached to the vehicle and the exhaust system using a pair of hanger pins 60. The abovediscussion regarding bracket 32 applies also tobracket 132. Exhaustsystem isolator assembly 130 can be a replacement for exhaustsystem isolator assembly 30. - Referring now to
FIGS. 6-7 , an exhaustsystem isolator assembly 230 comprises abracket 232 and anexhaust system isolator 234.Bracket 232 is a metal or plastic component which defines a pair of mountingflanges 236 and anisolator interface 238. Each of the pair of mountingflanges 236 defines a mountingbore 240 which accepts a fastener for securing exhaustsystem isolator assembly 230 to a vehicle frame or another structural component of the vehicle. WhileFIG. 6 illustrates mountingflanges 236 being generally perpendicular to each other, it is within the scope of the present disclosure to arrange mountingflanges 236 in any orientation which is required to havebracket 232 properly interface with the mounting structure of the vehicle. Exhaustsystem isolator assembly 230 can be a replacement for exhaustsystem isolator assembly 30. - Referring now to
FIG. 7 ,exhaust system isolator 234 comprises an innerstructural member 250, an outerstructural member 252 and anelastomeric body 254 disposed betweenstructural members -
Elastomeric body 254 defines a mountingbore 258 which is designed to accept an inner tube, a bolt, or ahanger pin 60.Hanger pin 60 is attached to a component of exhaust system 10. Whilebracket 232 is disclosed as being attached to a structural component of the vehicle andexhaust system isolator 234 is disclosed as being attached to a component of exhaust system 10, usinghanger pin 60, it is within the scope of the present disclosure to havebracket 232 attached to exhaust system 10 and exhaust system isolator 234 attached to a structural component of the vehicle usinghanger pin 60. Thus, exhaust system 10 is secured to the vehicle through one or more exhaustsystem isolator assemblies 230. -
Elastomeric body 254 defines afirst chamfer 260 located at one end of mountingbore 258 and asecond chamfer 262 located at the opposite end of mountingbore 258.First chamfer 260 interfaces with an enlarged head onhanger pin 60.Second chamfer 262 is larger thanfirst chamfer 260 and it allows for the conical rotation or deflection of innerstructural member 250 with respect tohanger pin 60 and outerstructural member 252. In the preferred embodiment, the large diameter ofsecond chamfer 262 is approximately one and one-half times the diameter of mountingbore 258 andsecond chamfer 262 has an overall length in the axial direction of mountingbore 258 of approximately twenty millimeters.Elastomeric body 254 defines an outercircumferential void 264 and an innercircumferential void 266. Whilevoids bore 258, it is within the scope of the present disclosure to havevoids bore 258. The asymmetrical design forvoids permits mounting bore 258 to become disposed at or near the centerline of outerstructural member 252 during the assembled or statically loaded condition of exhaustsystem isolator assembly 230. - The design of
void 266, specifically its radial thickness, will determine the amount of travel of mountingbore 258 with respect to outerstructural member 252 andbracket 232 until the load to radially deflect exhaustsystem isolator assembly 230 spikes up due to the closing ofvoid 266. Until the closing ofvoid 266, the radial movements of mountingbore 258 cause pure shear inelastomeric body 254 regardless of the loading direction. This shear loading occurs in the portion ofelastomeric body 254 disposed between outerstructural member 252 and innerstructural member 250 as discussed below. - As can be seen in the figures, void 264 overlaps inner
circumferential void 266 in the axial direction to define ashear hub 270 which undergoes the shear loading due to the deflection ofelastomeric body 254. During larger loading of exhaustsystem isolator assembly 230, void 266 will close until innerstructural member 250 makes contact with outerstructural member 252. This contact between innerstructural member 250 and outerstructural member 252 eliminates the compression and thus the compression stresses onshear hub 270 when exhaustsystem isolator assembly 230 experiences high ground-out loads. This improves both the performance and the reliability of exhaustsystem isolator assembly 230. - An annular
elastomeric heat shield 272 forms the outer portion of outercircumferential void 264.Elastomeric heat shield 272 is integral withelastomeric body 254.Elastomeric heat shield 272 provides protection against external sources of heat forshear hub 270. - Inner
structural member 250 is a flanged cylindrical metal or plastic component which includes anaxial cylinder 276 and aradial flange 278.Axial cylinder 276 extends over mountingbore 258 andradial flange 278 extends radially outward fromaxial cylinder 276 to provide a base forshear hub 270.Elastomeric body 254 is bonded to innerstructural member 250 includingshear hub 270 being bonded toradial flange 278. - Outer
structural member 252 is a multi-flanged cylindrical metal or plastic component which includes a first axial cylinder 282 a firstradial flange 284, a secondaxial cylinder 286 and a secondradial flange 288. Firstaxial cylinder 282 extends over innercircumferential void 266 and is designed to be press-fit into or otherwise acceptbracket 232. While exhaustsystem isolator assembly 230 is illustrated using aseparate bracket 232, it is within the scope of the present disclosure to integrate outerstructural member 252 andbracket 232 andbond shear hub 270 directly tobracket 232. Firstradial flange 284 extends radially outwardly from firstaxial cylinder 276 to provide a base forshear hub 270 at the opposite end ofshear hub 270.Elastomeric body 254 is bonded to outerstructural member 252 includingshear hub 270 being bonded to firstaxial cylinder 282 and firstradial flange 284. -
Bracket 232 is a metal or plastic bracket having an innercylindrical wall 290, anouter wall 292 and aradial wall 294 extending between innercylindrical wall 290 andouter wall 292. Innercylindrical wall 290 is designed to be press-fit over firstaxial cylinder 282 of outerstructural member 252 as illustrated inFIG. 7 . - Referring now to
FIG. 7 , it can be seen thataxial cylinder 276 of innerstructural member 250 extends through the aperture defined by firstaxial cylinder 282 of outerstructural member 252 and through innercylindrical wall 290 ofbracket 232. This provides a travel stop for the radial movement of innerstructural member 250 in relation to outerstructural member 252 which eliminates compression and thus compression stresses onshear hub 270. Innerstructural member 250 will move radially with respect to outerstructural member 252 to close innercircumferential void 266 until innerstructural member 250 contacts outerstructural member 252. An annular portion ofelastomeric body 254 located on the outside of innerstructural member 250 and the inside of outerstructural member 252 provides a cushioning affect and avoids direct contact between innerstructural member 250 and outerstructural member 252. Ifbracket 232 is integrated with outerstructural member 252 to attach exhaustsystem isolator assembly 230 to the structural component of the vehicle, either firstaxial cylinder 282 of outerstructural member 252, the structural component of the vehicle or a separate bracket can be used for the stop. - Exhaust system isolator 234 avoids tension stress loading in
elastomeric body 254 during radial loading. The shear style loading in all directions enables exhaust system isolator 234 to achieve a lower and more stable rate of deflection. This is because the shear modulus (shear loading) is lower than the elasticity modulus (tensile loading). Also, the spring rate of elastomeric materials in shear is more consistent than in tensile. The rates and deflections are capable of being symmetrical about the center axis or they can be tuned using press-fit apertures 62 or by otherwise altering the size or shape ofelastomeric body 254 or the rigid structures. An additional advantage is that the rate of deflection forshear hub 270 is linear throughout the deflection (untilvoid 266 closes) which adds robustness to the design in regards to the position. This means that any pre-load from positional tolerances will not spike the rates of deflection and make the Noise, Vibration and Harshness (NVH) of the vehicle change with the exhaust geometry tolerances. - The
second chamfer 262 allows for the conical movement or rotation of innerstructural member 250 with respect tohanger pin 60 and outerstructural member 252. The allowance of this conical motion significantly improves the durability of the component by reducing the cantilever beam stress at the bottom portion of outercircumferential void 264 and innercircumferential void 266. - The mounting system for exhaust system isolator 34 or 234 is not limited to using
bracket 32,bracket 132 orbracket 232. Any of the mounting systems disclosed in Applicant's co-pending application Ser. No. 11/233,283, the disclosure of which is incorporated herein by reference, could be utilized to mount exhaust system isolator 34 or 234 to the vehicle. - Referring now to
FIGS. 8-10 , anexhaust system isolator 330 is illustrated. Exhaust system isolator 330 can be a replacement for exhaustsystem isolator assembly 30. Exhaust system isolator 330 comprises a first innerstructural member 332, a second innerstructural member 334, an outerstructural member 336 and anelastomeric body 338. -
Elastomeric body 338 defines afirst bore 340 and asecond bore 342, each of which is designed as a structural member to accept an inner tube, a bolt orhanger pin 60. Onehanger pin 60 is attached to a structural component of the vehicle and onehanger pin 60 is attached to a component of exhaust system 10. -
Elastomeric body 338 defines a firstcircumferential void 346 which is disposed aroundfirst bore 340 and a secondcircumferential void 348 which is disposed aroundsecond bore 342. The design forcircumferential void 346 will determine the amount of travel offirst bore 340 with respect to outerstructural member 336. The design for secondcircumferential void 348 will determine the amount of travel ofsecond bore 342 with respect to outerstructural member 336. Thus, the design ofcircumferential voids first bore 340 with respect tosecond bore 342 until the load to radically defect exhaust system isolator 330 spikes up due to the closing ofcircumferential voids circumferential voids first bore 340 with respect tosecond bore 342 cause pure shear inelastomeric body 338 regardless of the load direction. This shear loadings occurs in a first annular orfrustoconical shear hub 352 and a second annular orfrustoconical shear hub 354 defined byelastomeric body 338. Firstannual shear hub 352 is disposed between first innerstructural member 332 and outerstructural member 336. Secondannular shear hub 354 is disposed between second innerstructural member 334 and outerstructural member 336. Tuning for rate and deflection in selected directions can be accomplished independently from other directions by altering the design ofelastomeric body 338 using different shaped voids, different wall thickness, different shapes forelastomeric body 338 and by other means known in the art. - As can be seen from the Figures, the portion of
elastomeric body 338 which encases first innerstructural member 332 is attached to the portion ofelastomeric body 338 that covers outerstructural member 336 byannular shear hub 352. The portion ofelastomeric body 338 which encases second innerstructural member 334 is attached to the portion ofelastomeric body 338 that covers outerstructural member 336 byannular shear hub 354. During movements offirst bore 340 with respect tosecond bore 342,annular shear hubs first bore 340 with respect tosecond bore 342, firstcircumferential void 346 and/or secondcircumferential void 348 will close. At this point of time, the rate of deflection of exhaust system isolator 330 spikes up because the load is now being resisted by outerstructural member 336 and one or both of innerstructural members annular shear hub 352 and/orannular shear hub 354. One of the advantages forexhaust system isolator 330 is that whencircumferential voids 346 and/or 348 close, there is no direct tension or compression ofannular shear hubs 352 and/or 354. - First inner
structural member 332 is a metal or plastic component which comprises a generallycylindrical center portion 362 and anannular flange portion 364 attached to one end of generallycylindrical center portion 362. Generallycylindrical center portion 362 extends overfirst bore 340 andflange portion 364 extends radially outward from the one end of generallycylindrical center portion 362.Flange portion 364 provides a base for one end ofannular shear hub 352.Elastomeric body 338 fully encapsulates first innerstructural member 332 and is bonded to innerstructural member 332 includingannular shear hub 352 toannular flange portion 364. - Second inner
structural member 334 is a metal or plastic component which comprises a generallycylindrical center portion 372 and anannular flange portion 374 attached to one end of generallycylindrical center portion 372. Generallycylindrical center portion 372 extends oversecond bore 342 andflange portion 374 extends radially outward from the one end of generallycylindrical center portion 372.Flange portion 374 provides a base for one end ofannular shear hub 354.Elastomeric body 338 fully encapsulates second innerstructural member 334 and is bonded to innerstructural member 334 includingannual shear hub 354 toannular flange portion 374. As illustrated inFIGS. 8-10 ,flange portions exhaust system isolator 330. - Outer
structural member 336 is a metal or plastic component which comprises acentral portion 380, a first axially extendingcylindrical portion 382 and a second axial extendingcylindrical portion 384.Central portion 380 is a generally planar component having a generally L-shaped flange on its outer periphery.Central portion 380 defines afirst bore 386 and asecond bore 388. First innerstructural member 332 extends throughfirst bore 386 and is surrounded by first axially extendingcylindrical portion 382. Second innerstructural member 334 extends throughsecond bore 388 and is surrounded by second axially extendingcylindrical portion 384.Central portion 380 and first axially extendingcylindrical portion 382 provide a base forannular shear hub 352.Central portion 380 and second axially extendingcylindrical portion 384 provide a base forannular shear hub 354.Elastomeric body 338 fully encapsulates outerstructural member 336 and is bonded to outerstructural member 336 includingannular shear hubs structural member 336. -
Annular shear hubs second bores annular shear hubs annular shear hubs structural members structural member 336 which will contact each other during peak loading. Thus, during peak loadings,annular shear hubs structural members structural member 336. -
Elastomeric body 338 defines afirst chamfer 390 located at one end offirst bore 340, and asecond chamfer 392 at the opposite end offirst bore 340.First chamfer 390 interfaces with an enlarged head onhanger pin 60.Second chamfer 392 is larger thanfirst chamfer 390 and it allows for conical rotation or deflection for first innerstructural member 332 with respect tohanger pin 60 and outerstructural member 336. In the preferred embodiment, the large diameter ofsecond chamfer 392 is approximately one and one-half times the diameter offirst bore 340 andsecond chamfer 392 has an overall length in the axial direction offirst bore 340 of approximately twenty millimeters. -
Elastomeric body 338 defines afirst chamfer 394 located at one ofsecond bore 342 and asecond chamfer 396 at the opposite end ofsecond bore 342.First chamfer 394 interfaces with an enlarged head onhanger pin 60.Second chamfer 396 is larger thanfirst chamfer 394 and it allows for conical rotation or deflection of second innerstructural member 334 with respect tohanger pin 60 and outerstructural member 336. In the preferred embodiment, the large diameter ofsecond chamfer 396 is approximately one and one-half times the diameter ofsecond bore 342 andsecond chamfer 396 has an overall length in the axial direction ofsecond bore 342 of approximately twenty millimeters. - Referring now to
FIGS. 11-13 , anexhaust system isolator 430 is illustrated. Exhaust system isolator 430 can be a replacement for exhaustsystem isolator assembly 30. Exhaust system isolator 430 comprises a first innerstructural member 432, a second innerstructural member 434, an outerstructural member 436 and anelastomeric body 438. -
Elastomeric body 438 defines afirst bore 440 and asecond bore 442, each of which is designed as a structural member to accept an inner tube, a bolt orhanger pin 60. Onehanger pin 60 is attached to a structural component of the vehicle and onehanger pin 60 is attached to a component of exhaust system 10. -
Elastomeric body 438 defines a firstcircumferential void 446 which is disposed aroundfirst bore 440 and a secondcircumferential void 448 which is disposed aroundsecond bore 442. The design forcircumferential void 446 will determine the amount of travel offirst bore 440 with respect to outerstructural member 436. The design forcircumferential void 448 will determine the amount of travel ofsecond bore 442 with respect to outerstructural member 436. Thus, the design ofcircumferential voids first bore 440 with respect tosecond bore 442 until the load to radically defect exhaust system isolator 430 spikes up due to the closing ofcircumferential voids circumferential voids first bore 440 with respect tosecond bore 442 cause pure shear inelastomeric body 438 regardless of the load direction. This shear loadings occurs in a first annular orfrustoconical shear hub 452 and a second annular orfrustoconical shear hub 454 defined byelastomeric body 438. Firstannual shear hub 452 is disposed between first innerstructural member 432 and outerstructural member 436. Secondannular shear hub 454 is disposed between second innerstructural member 434 and outerstructural member 436. Tuning for rate and deflection in selected directions can be accomplished independently from other directions by altering the design ofelastomeric body 438 using different shaped voids, different wall thickness, different shapes forelastomeric body 438 and by other means known in the art. - As can be seen from the Figures, the portion of
elastomeric body 438 which encases first innerstructural member 432 is attached to the portion ofelastomeric body 438 that covers outerstructural member 436 byannular shear hub 452. The portion ofelastomeric body 438 which encases second innerstructural member 434 is attached to the portion ofelastomeric body 438 that covers outerstructural member 436 byannular shear hub 454. During movements offirst bore 440 with respect tosecond bore 442,annular shear hubs first bore 440 with respect tosecond bore 442, firstcircumferential void 446 and/or secondcircumferential void 448 will close. At this point of time, the rate of deflection of exhaust system isolator 430 spikes up because the load is now being resisted by outerstructural member 436 and one or both of innerstructural members annular shear hub 452 and/orannular shear hub 454. One of the advantages forexhaust system isolator 430 is that whencircumferential voids 446 and/or 448 close, there is no direct tension or compression ofannular shear hubs 452 and/or 454. - First inner
structural member 432 is a metal or plastic component which comprises a generallycylindrical center portion 462 and anannular flange portion 464 attached to one end of generallycylindrical center portion 462. Generallycylindrical center portion 462 extends overfirst bore 440 andflange portion 464 extends radially outward from the one end of generallycylindrical center portion 462.Flange portion 464 provides a base for one end ofannular shear hub 452.Elastomeric body 438 fully encapsulates first innerstructural member 432 and is bonded to innerstructural member 432 includingannular shear hub 452 toannular flange portion 464. - Second inner
structural member 434 is a metal or plastic component which comprises a generallycylindrical center portion 472 and anannular flange portion 474 attached to one end of generallycylindrical center portion 472. Generallycylindrical center portion 472 extends oversecond bore 442 andflange portion 474 extends radially outward from the one end of generallycylindrical center portion 472.Flange portion 474 provides a base for one end ofannular shear hub 454.Elastomeric body 438 fully encapsulates second innerstructural member 434 and is bonded to innerstructural member 434 includingannual shear hub 454 toannular flange portion 474. As illustrated inFIGS. 11-13 ,flange portions exhaust system isolator 430. - Outer
structural member 436 is a metal or plastic component which comprises acentral portion 480, a first axially extendingcylindrical portion 482 and a second axial extendingcylindrical portion 484.Central portion 480 is a generally planar component having a generally L-shaped flange on its outer periphery.Central portion 480 defines afirst bore 486 and asecond bore 488. First innerstructural member 432 extends throughfirst bore 486 and is surrounded by first axially extendingcylindrical portion 482. Second innerstructural member 434 extends throughsecond bore 488 and is surrounded by second axially extendingcylindrical portion 484.Central portion 480 and first axially extendingcylindrical portion 482 provide a base forannular shear hub 452.Central portion 480 and second axially extendingcylindrical portion 484 provide a base forannular shear hub 454.Elastomeric body 438 fully encapsulates outerstructural member 436 and is bonded to outerstructural member 436 includingannular shear hubs structural member 436. -
Annular shear hubs second bores annular shear hubs annular shear hubs structural members structural member 436 which will contact each other during peak loadings. Thus, during peak loadings,annular shear hubs inner structure members structural member 436. -
Elastomeric body 438 defines afirst chamfer 490 located at one end offirst bore 440, and asecond chamfer 492 at the opposite end offirst bore 440.First chamfer 490 interfaces with an enlarged head onhanger pin 60.Second chamfer 492 is larger thanfirst chamfer 490 and it allows for conical rotation or deflection for first innerstructural member 432 with respect tohanger pin 60 and outerstructural member 436. In the preferred embodiment, the large diameter ofsecond chamfer 492 is approximately one and one-half times the diameter offirst bore 440 andsecond chamfer 492 has an overall length in the axial direction offirst bore 440 of approximately twenty millimeters. -
Elastomeric body 438 defines afirst chamfer 494 located at one ofsecond bore 442 and asecond chamfer 496 at the opposite end ofsecond bore 442.First chamfer 494 interfaces with an enlarged head onhanger pin 60.Second chamfer 496 is larger thanfirst chamfer 494 and it allows for conical rotation or deflection of second innerstructural member 434 with respect tohanger pin 60 and outerstructural member 436. In the preferred embodiment, the large diameter ofsecond chamfer 496 is approximately one and one-half times the diameter ofsecond bore 442 andsecond chamfer 496 has an overall length in the axial direction ofsecond bore 442 of approximately twenty millimeters. - Referring now to
FIGS. 14-16 , anexhaust system isolator 530 is illustrated. Exhaust system isolator 530 can be a replacement for exhaustsystem isolator assembly 30. Exhaust system isolator 530 comprises a first innerstructural member 532, a second innerstructural member 534, an outerstructural member 536 and anelastomeric body 538. -
Elastomeric body 538 defines afirst bore 540 and asecond bore 542 each of which is designed as a structural member to accept an inner tube, a bolt orhanger pin 60. Onehanger pin 60 is attached to a structural component of this vehicle and onehanger pin 60 is attached to a component of exhaust system 10. -
Elastomeric body 538 defines a firstcircumferential void 546 which is disposed aroundfirst bore 540 and a secondcircumferential void 548 which is disposed aroundsecond bore 542. The design forcircumferential void 546 will determine the amount of travel offirst bore 540 with respect to outerstructural member 536. The design forcircumferential void 548 will determine the amount of travel ofsecond bore 542 with respect to outerstructural member 536. Thus, the design ofcircumferential voids first bore 540 with respect tosecond bore 542 until the load to radially deflect exhaust system isolator 530 spikes due to the closing ofcircumferential voids circumferential voids first bore 540 with respect tosecond bore 542 cause pure shear inelastomeric body 538 regardless of the load direction. The shear loading occurs in a first annular orfrustoconical shear hub 552 and a second annular orfrustoconical shear hub 554 defined byelastomeric body 538. Firstannular shear hub 552 is disposed between first innerstructural member 532 and outerstructural member 536. Secondannular shear hub 554 is disposed between second innerstructural member 534 and outerstructural member 536. As illustrated in the Figures, betweenfirst bore 540 andsecond bore 542,annular shear hub 552 andannular shear hub 554 combine to form a single common or integral shear hub. Tuning for rate and deflection in selected directions can be accomplished independently from other directions by altering the design ofelastomeric body 538 using different shaped voids, different wall thicknesses, different shapes forelastomeric body 538 and by other means known in this art. - As can be seen from the Figures, the portion of
elastomeric body 538 which encases first innerstructural member 532 is attached to the portion ofelastomeric body 538 that covers outerstructural member 536 byannular shear hub 552. The portion ofelastomeric body 538 which encases second innerstructural member 534 is attached to the portion ofelastomeric body 538 that covers outerstructural member 536 byannular shear hub 554. During movements offirst bore 540 with respect tosecond bore 542,annular shear hubs first bore 540 with respect tosecond bore 542 firstcircumferential void 546 and/or secondcircumferential void 548 will close. At this point of time, the rate of deflection of exhaust system isolator 530 spikes up because the load is now being resisted by outerstructural member 536 and one or both of innerstructural member annular shear hub 552 and/orannular shear hub 554. One of the advantages forexhaust system isolator 530 is that whencircumferential voids 546 and/or 548 close, there is no direct tension or compression ofannular shear hubs 552 and/or 554. - First inner
structural member 532 is a metal or plastic component which comprises a generallycylindrical center portion 562 and anannular flange portion 564 attached to one end of generallycylindrical center portion 562. Generallycylindrical center portion 562 extends overfirst bore 540 andflange portion 564 extends radially outward from the one end of generallycylindrical center portion 562.Flange portion 564 provides a base for one end ofannular shear hub 552.Elastomeric body 538 fully encapsulates first innerstructural member 532 and is bonded to first innerstructural member 532 includingannular shear hub 552 toflange portion 564. - Second inner
structural member 534 is a metal or plastic component which comprises a generallycylindrical center portion 572 and anannular flange portion 574 attached to one end of generallycylindrical center portion 572. Generallycylindrical center portion 572 extends oversecond bore 542 andflange portion 574 extends radially outward from the one end of generallycylindrical center portion 572.Flange portion 574 provides a base for one end ofannular shear hub 554.Elastomeric body 538 fully encapsulates second innerstructural member 534 and is bonded to second innerstructural member 534 includingannular shear hub 554 toflange portion 574. As illustrated inFIGS. 14-16 ,flange portions exhaust system isolator 530. - Outer
structural member 536 is a metal or plastic component which comprises acentral portion 580, a firstaxially extending portion 582 and a secondaxially extending portion 584.Central portion 580 is a generally oval shaped component having a generally L-shaped flange on its outer periphery.Central portion 580 defines acentral bore 586. First innerstructural member 532 extends throughcentral bore 586 and is partially surrounded by firstaxially extending portion 582. Second innerstructural member 534 also extends throughcentral bore 586 and is partially surrounded by secondaxially extending portion 584.Central portion 580 and first axial extendingportion 582 provide a base forannular shear hub 552.Central portion 580 and second axially extendingportion 584 provide a base forannular shear hub 554.Elastomeric body 538 fully encapsulates outerstructural member 536 and is bonded to outerstructural member 536 includingannular shear hubs structural member 536. -
Annular shear hubs second bores annular shear hubs annular shear hubs structural members structural member 336 which will contact each other during peak loading. The portion ofannular shear hubs first bore 540 andsecond bore 542 which form the single, common or integral shear hub, could undergo compression if the loading caused first bore 540 to move directly towardssecond bore 542 but this is a limited movement ofexhaust system isolator 530. -
Elastomeric body 538 defines afirst chamfer 590 located at one end offirst bore 540 and asecond chamfer 592 at the opposite end offirst bore 540.First chamfer 590 interfaces with an enlarged head onhanger pin 60.Second chamfer 592 is larger thanfirst chamfer 590 and it allows for conical rotation or deflection of first innerstructural member 532 with respect tohanger pin 60 and outerstructural member 536. In the preferred embodiment, the large diameter ofsecond chamfer 592 is approximately one and one-half times the diameter offirst bore 540 andsecond chamfer 592 has an overall length in the axial direction offirst bore 540 of approximately twenty millimeters. -
Elastomeric body 538 defines afirst chamfer 594 located at one end ofsecond bore 542 and asecond chamfer 596 at the opposite end ofsecond bore 542.First chamfer 594 interfaces with an enlarged head onhanger pin 60.Second chamfer 596 is larger thanfirst chamfer 594 and it allows for conical rotation on deflection of second innerstructural member 534 with respect tohanger pin 60 and outerstructural member 536. In the preferred embodiment, the large diameter ofsecond chamfer 596 is approximately one and one-half times the diameter ofsecond bore 542 andsecond chamfer 596 has an overall length in the axial direction ofsecond bore 542 of approximately twenty millimeters. - Referring now to
FIGS. 17-19 , an exhaust system isolator 630 in accordance with another embodiment of the present disclosure is illustrated. Exhaust system isolator 630 comprises an innerstructural member 632, an outerstructural member 634 and anelastomeric body 636. -
Elastomeric body 636 defines a first mounting bore 640 and a second mounting bore 642, each of which is designed as a structural member to accept an inner tube, a bolt or ahanger pin 60. Onehanger pin 60 is attached to a structural component of the vehicle and onehanger pin 60 is attached to a component of exhaust system 10. -
Elastomeric body 636 defines acircumferential void 646 which is located below first mountingbore 640. The portion ofelastomeric body 636 that forms second mountingbore 642 definescircumferential void 646. The design ofcircumferential void 646 and the design of the portion ofelastomeric body 636 that forms second mountingbore 642 will determine the amount of travel of second mounting bore 642 with respect to first mountingbore 640 until the load to radially deflect exhaust system isolator 630 spikes up due to the closing ofcircumferential void 646 or the gap between the portion ofelastomeric body 636 that defines second mountingbore 642 and the portion ofelastomeric body 636 that encases outerstructural member 634. Untilcircumferential void 646 or this gap is closed, radial movements of second mounting bore 642 with respect to first mounting bore 640 cause pure shear inelastomeric body 636 regardless of the loading direction. The shear loading occurs in an annularfrustoconical shear hub 650 defined byelastomeric body 636 which is disposed between outerstructural member 634 and innerstructural member 632 as discussed below. Tuning for rate and deflection in selected directions can be accomplished independently from other directions by altering the design ofelastomeric body 636, using different shaped voids, additional voids, different shapes forelastomeric body 636 and by other means known in the art. - As can be seen from the figures, the portion of
elastomeric body 636 which forms second mountingbore 642 is attached to the portion ofelastomeric body 636 which fully encapsulates outerstructural member 634 and forms first mountingbore 640 to formcircumferential void 646 byannular shear hub 650. During movements ofexhaust system isolator 630,annular shear hub 650 is loaded in shear. During larger movements ofexhaust system isolator 630, the gap between the portion ofelastomeric body 636 forming second mounting bore 642 and the portion ofelastomeric body 636 encapsulating outerstructural member 634 and formingcircumferential void 646 closes. At this point in time, the rate of deflection of exhaust system isolator 630 spikes up because the load is now being resisted by innerstructural member 632 and outerstructural member 634 rather than byannular shear hub 650. One of the advantages forexhaust system isolator 630 is that when this gap is closed, there is no direct tension or compression ofannular shear hub 650. - Inner
structural member 632 is a metal or plastic component which comprises a generallycylindrical center portion 652 and anannular flange portion 654 attached to one end of generallycylindrical center portion 652. Generallycylindrical center portion 652 extends over or surrounds second mounting bore 642 to provide support for holdinghanger pin 60 andannular flange portion 654 extends radially outward from the one end of generallycylindrical center portion 652.Annular flange portion 654 is an annular shaped component which provides a base for one end ofannular shear hub 650.Elastomeric body 636 fully encapsulates innerstructural member 632 and is bonded to innerstructural member 632 includingannular shear hub 650 being bonded toannular flange portion 654. - Outer
structural member 634 is a metal or plastic component which comprises amain portion 660 having a generally planar wall which defines afirst aperture 662, an axially extendingcylindrical section 664, asecond aperture 666 and an axially extendingcylindrical section 668.Main portion 660 provides a base for the other end ofannular shear hub 650. First mountingbore 640 extends throughfirst aperture 662 and axially extendingcylindrical section 664 surrounds first mountingbore 640 to provide support for holdinghanger pin 60. Innerstructural member 632 extends throughsecond aperture 666 and axially extendingcylindrical section 668 surrounds innerstructural member 632 to act as a stop forexhaust system isolator 630.Elastomeric body 636 encapsulates outerstructural member 634 includingannular shear hub 650 being bonded to outerstructural member 634. -
Annular shear hub 650 is arranged in an axial direction of exhaust system isolator 630 such that any radial loading from the application causes shear stress inannular shear hub 650. In addition,annular shear hub 650 is not disposed between portions of innerstructural member 632 and outerstructural member 634 which will contact each other during peak loading. Thus, during peak loadings,annular shear hub 650 is not compressed between innerstructural member 632 and outerstructural member 634. - As illustrated in
FIGS. 17-19 , an optional annularelastomeric heat shield 672 forms an outercircumferential void 674 disposed aroundannular shear hub 650.Elastomeric heat shield 672 is integral withelastomeric body 636. Elastomeric heat shield provides protection against external sources of heat forannular shear hub 650. -
Elastomeric body 636 defines afirst chamfer 690 located at one end of second mounting bore 642 and asecond chamfer 692 located at the opposite end of second mounting bore 642.First chamfer 690 interfaces with an enlarged head onhanger pin 60.Second chamfer 692 is larger thanfirst chamfer 690 and it allows for the conical rotation or deflection of innerstructural member 632 with respect tohanger pin 60 and outerstructural member 634. In the preferred embodiment, the larger diameter ofsecond chamfer 692 is approximately one and one-half times the diameter of second mounting bore 642 andsecond chamfer 692 has an overall length of approximately twenty millimeters.Second chamfer 692 allows for the conical movement or rotation of innerstructural member 632 with respect tohanger pin 60. The allowance of this conical motion significantly improves the durability of the component by reducing the cantilever beam stress at the bottom portion ofcircumferential void 646. - The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the invention, and all such modifications are intended to be included within the scope of the invention.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US13/682,799 US8646761B2 (en) | 2008-03-06 | 2012-11-21 | External shear-hub isolator |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/043,498 US8066266B2 (en) | 2008-03-06 | 2008-03-06 | End plated shear-hub isolator |
US12/045,139 US8152146B2 (en) | 2008-03-10 | 2008-03-10 | External shear-hub isolator |
US12/369,024 US8376331B2 (en) | 2008-03-06 | 2009-02-11 | External shear-hub isolator |
US13/682,799 US8646761B2 (en) | 2008-03-06 | 2012-11-21 | External shear-hub isolator |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/369,024 Continuation US8376331B2 (en) | 2008-03-06 | 2009-02-11 | External shear-hub isolator |
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US20130075965A1 true US20130075965A1 (en) | 2013-03-28 |
US8646761B2 US8646761B2 (en) | 2014-02-11 |
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US12/369,024 Active 2030-08-31 US8376331B2 (en) | 2008-03-06 | 2009-02-11 | External shear-hub isolator |
US13/682,799 Active US8646761B2 (en) | 2008-03-06 | 2012-11-21 | External shear-hub isolator |
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US12/369,024 Active 2030-08-31 US8376331B2 (en) | 2008-03-06 | 2009-02-11 | External shear-hub isolator |
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US (2) | US8376331B2 (en) |
JP (1) | JP5417348B2 (en) |
KR (2) | KR20150080649A (en) |
CN (1) | CN101970825B (en) |
BR (1) | BRPI0909309B1 (en) |
DE (1) | DE112009000528B4 (en) |
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Also Published As
Publication number | Publication date |
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KR20100124777A (en) | 2010-11-29 |
WO2009114517A3 (en) | 2009-11-12 |
JP2011519403A (en) | 2011-07-07 |
US8646761B2 (en) | 2014-02-11 |
US8376331B2 (en) | 2013-02-19 |
CN101970825A (en) | 2011-02-09 |
KR20150080649A (en) | 2015-07-09 |
DE112009000528T5 (en) | 2011-03-03 |
WO2009114517A2 (en) | 2009-09-17 |
DE112009000528B4 (en) | 2017-02-23 |
BRPI0909309B1 (en) | 2019-12-31 |
KR101633041B1 (en) | 2016-06-23 |
US20090224450A1 (en) | 2009-09-10 |
BRPI0909309A2 (en) | 2015-08-11 |
CN101970825B (en) | 2012-12-12 |
JP5417348B2 (en) | 2014-02-12 |
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